Display Luminance Compensation via Dynamic Voltage Adjustment
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Solution Overview
Problem
Display panels experience luminance differences due to voltage leaks, leading to increased flicker and degraded display quality as the frequency of the vertical start signal decreases, resulting in uneven luminance across the panel.
Innovation Solution
A display apparatus with a luminance measurer, timing controller, and light source driver that measures and adjusts the luminance of each display area independently by generating a dimming signal to synchronize the light source luminance with the panel luminance, ensuring symmetric waveforms and reducing flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the frequency of the vertical start signal is decreased to reduce power consumption, then energy efficiency is improved, but luminance uniformity deteriorates and flicker increases
Solution Approach 1:
The patent adjusts the pixel voltage parameter dynamically based on the vertical start signal frequency. When the frequency decreases, the pixel voltage is increased to compensate for the longer discharge time, thereby maintaining luminance uniformity while allowing lower operating frequencies for reduced power consumption
Solution Approach 2:
The patent implements a feedback mechanism where the pixel voltage is adjusted according to the detected vertical start signal frequency. The system monitors the frequency and automatically modifies the pixel voltage to maintain consistent luminance output, resolving the contradiction between low-frequency operation and luminance stability
2Stability of the object's composition
If the pixel voltage is increased to compensate for voltage leak, then luminance uniformity is improved, but power consumption increases
Solution Approach 1:
The patent employs dynamic voltage adjustment where the pixel voltage is not fixed but varies according to the vertical start signal frequency. This allows the system to use higher voltage only when necessary (at lower frequencies) and maintain lower voltage at normal frequencies, balancing luminance uniformity with power consumption
Solution Approach 2:
The system changes the pixel voltage parameter adaptively based on operating conditions. By linking voltage level to vertical start signal frequency, the patent achieves luminance uniformity compensation without sustained high power consumption, as the elevated voltage is applied only during low-frequency operation
Data Source
AI summary
A display apparatus includes a display panel for displaying an image and that includes a plurality of display areas, a light source part for providing a light to the display panel, a luminance measurer for measuring a luminance of each display area of the display panel and outputting a panel luminance signal of each display area of the display panel, and a light source driver for driving the light source part based on the panel luminance signal to decrease the light source luminance signal of each display area of the display panel when the panel luminance signal of each display area of the display panel increases and to increase the light source luminance signal of each display area of the display panel when the panel luminance signal of each display area of the display panel decreases.